How to create trigger on database insert

USE [ZCLS_MM]
GO
/****** Object: Trigger [dbo].[TriggerOnInsert] Script Date: 09/19/2012 11:12:28 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =========================================================
-- Author: Ravi Sharma
-- Create date: 10/10/2012
-- Description: Trigger to auto insert into other database
-- =========================================================
ALTER TRIGGER [dbo].[TriggerOnInsert]
ON [ZCLS_MM].[dbo].[MessageTransaction]
FOR INSERT


AS
BEGIN

select distinct i.MessageID,i.ChannelNo,i.ExtensionNo,i.IPAddress,i.MessageFileName,i.MessageDate,i.CallerId,i.InOutFlag,
i.PlayPath,i.Information from inserted i

declare
@MessageID numeric(10, 0),
@ChannelNo numeric(3, 0),
@ExtensionNo nvarchar(50),
@IPAddress nvarchar(50),
@MessageFileName nvarchar(255),
@MessageDate datetime,
@CallerId nvarchar(50),
@InOutFlag int,
@PlayPath nvarchar(255),
@Information char(25)

select @ChannelNo=i.ChannelNo from inserted i;
select @ExtensionNo=i.ExtensionNo from inserted i;
select @IPAddress=i.IPAddress from inserted i;
select @MessageFileName=i.MessageFileName from inserted i;
select @MessageDate=i.MessageDate from inserted i;
select @CallerId=i.CallerId from inserted i;
select @InOutFlag=i.InOutFlag from inserted i;
select @PlayPath=i.PlayPath from inserted i;
select @Information=i.Information from inserted i;

Insert into ZCLS.dbo.MessageTransaction(ChannelNo,ExtensionNo,IPAddress,MessageFileName,MessageDate,CallerId,InOutFlag,PlayPath,Information) values
(@ChannelNo,@ExtensionNo,@IPAddress,@MessageFileName,@MessageDate,@CallerId,@InOutFlag,@PlayPath,@Information)

PRINT 'AFTER INSERT trigger fired.'

END